[LMB] LMB as Mary-Sue

Except that Tony Stark has lots of problems, not least an inability to take
most things seriously, a vast and frequently hurtful arrogance, and
assorted psychological issues ranging from being convinced his father
didn't love him to PTSD.
Rather like Superman. The better Superman stories compensate for his
physical nigh-invincibility by giving him problems, challenges, and
obstacles that his powers don't assist him with, particularly ethical
conundrums.
Batman is super-competent... except for his own psychological issues and a
set of personal rules which cripple his effectiveness at achieving his
goals. (If he'd just kill the Joker, so many innocents would be saved...)
Matt G.